Pipe-coupling



(No Model.)

fas

2 snets-sheet 1. W. MARTIN. PIPE COUPLING.

Patented June 5, 1894.

(No Model.)

2 Sheets-Sheet 2. W. MARTIN.

PIPE eoUPLINe.

No. 521,122. Patented June 5, 1894.

y UNITED STATES PATENT OFFICE.

vWILLIAM MARTIN, OF DUNKIRK, NEW YORK.

PIPE-COUPLING.

SPECIFICATION forming part of Letters Patent No. 521,122, dated J' une5,1894.

PPGMOD filed March 16, 1893. Serial No. 466,283. (No model.)

-To @ZZ whom it may oon/cern,.-

Be it known that I, WILLIAM MARTIN, of Dunkirk, county of Chautauqua,and State of New York, have vinvented certain new and usefulImprovements in Pipe-Couplings, of which the following is a specication,reference being had to the accompanying drawings.

The object of my invention is to produce in pipe couplings, speciallyadapted for use in coupling the steam pipes of railway trains,improvements whereby'endwise strain upon them tends automatically toseparate them under undue strain, as for example when the cars composingthe train are uncoupled either accidentally or intentionally; and bywhich a close joint may be effected between the parts for a longerperiod of time without repair than in the ordinary coupling.

In the accompanying drawings, Figure 1 is a plan or top view of twoparts of my coupling united together. Fig. 2 is a horizontal section ofthe same. Fig. 3 is a face view of one of the parts with theclamping-lever removed. Fig. 4 shows atop plan view of a modified formVof my coupling.

Referring to the gures on the drawings, 1 indicates one part or sectionof my coupling, and 2 ,the other. Their ports 3- are respectivelysurrounded by annular packing rings 4, secured in place as by a threadedmetallic ring 5. The face of each part is provided on one end with apost 6, and on the otherend with lugs or bearing parts' 7. The lugs inone of the parts are adapted to straddle the post in the other when theparts are united. Each of the posts is provided with a lever S having acam surface 9. Ashaft 10 movably supports the lever in slotted bearings1.1 in the post. A box 12 is provided in the top of the post above theshaft, within which a spiral spring 13 is carried, one end thereofvpreferably resting directly upon the shaft,

and the other against a cap-nut 14 in the top of the post. By thisarrangement the pressure of the spring may be adjusted for the purposesof taking up wear. Instead of having a plain cam surface I may use anotched cam 15, shown in Fig. 4 of the drawings. This notch is adaptedto strike against a projection 16 upon the lugs 7. A stop-lug 17 may beprovided in each of the levers adapted to rest against the top of eachpart of the couplingwhen the parts are united. vIt should be observed inthis connection that the faces of the coupling parts are oblique to eachother; and that strain upon the ends of the parts tends to draw thefaces obliquely across each other. By the use of the modicatlon shown inFig. 4 of the drawings the projection 16 upon thelu gs engaging with thenotch of the cam 15 upon the lever tends to turn each of the levers uponits respective shaft, and to disengage and automaticallyv separate theparts under due strain. The lugs in the other figures are shown somewhatcurved, and a tendency of the parts is, in that form, to cause thelevers to rotate and to separate under undue strain; but it is notthought to be so positive and certain as in the modification shown inFig. 4. The lugs and levers upon opposite ends of the coupling sectionsconstitute in this connection locking mechanism for uniting the twoparts of the coupling.

1. The combination with a two part coupling, of a post and bearing lugsupon each of the parts, the lugs upon one part adapted to straddle thepost upon the other, with levers 8o provided with cam faces pivotallymounted in slotted bearings within the post, and adapted to bear againstthe lugs, said lugs and levers being provided with co-operatingprojections and notches, and a spring within '8 5 the post adapted toyieldingly sustain the connection between said levers and lugs,substantially as speciied.

2. In a two part coupling, the combination with posts projecting fromeach of the parts in opposite directions and carrying cam-levers,mounted in longitudinal slots, of springs in the posts adapted toactuate the levers, bearing lugs projecting from each of the partsadapted to be engaged bythe camlevers of the opposite part, saidprojection being provided with an -inclined shoulder adapted under aseparating strain to ride upon the opposite coupling part to force thelever against the action of the spring, substantially as specified.

In testimony of all which I have hereunto subscribed my name.

WILLIAM MARTIN.

